Pump jack



March 1, 1938. A. J. DREVLOW ET AL. 2,109,721

PUMP JACK Original Filed Sept. 5, 1955 lllllll/ll/ B Y J. Hiram Peterson A T TORNE Y Patented Mar. 1, 1938 UNITED STATES PATENT OFFICE PUMP JACK Alvin J. Drevlow,

John C. Drevlow, Richard O.

Drevlow, and John Hiram Peterson, Long Prairie, Minn.

2 Claims. (01. 74-45) cation Serial No. 38,894, filed September 3, 1935.

These and other features of the invention will be more particularly set forth in the following description and the accompanying drawing,

' wherein:

Figure 1 is a view in side elevation of the invention shown partly broken away.

Figure 2 is a plan view thereof.

Figure 3 is a partial sectional View on line 3-3 of Figure 1; and

Figure 4 is a sectional view on line 4-4 of Figure 1.

Referring to the drawing in detail, a housing framework is provided, consisting of side frame members 2 formed with rear and front supporting legs 3 and 4, the front legs 4 being supported upon the base 5 of the pump casing B. The frame members 2 are connected by the rear cross bars 1 and the front cross bars 8, said cross bars at their ends being detachably secured to the frame members, as by bolts 9. The front cross bar 8 has a centrally curved portion it! to fit against the pump housing and is held against said housing by the U-bolt I l extending around said housing, and with its ends passing through said cross bar and secured in position as by bolts 12.

As will be hereinafter particularly pointed out, the entire jack mechanism may be quickly disassembled by merely unfastening the cross bars of the side frame members. The working parts of the pump jack are supported by and between the side frame members, as hereinafter particularly set forth.

Having journal support 13 in the side frame members are the stub axles I 4, the inner ends of said stub axles supporting the crank arm 15. The cross bar 16 of the crank arm forms a journal support for a sleeve 11, a second sleeve l8 being carried by the sleeve 11, the sleeve 18 being positioned centrally of the sleeve I! and in parallel position to the side frame members, for the purpose set forth.

An ordinary grease cup 19 is carried by the sleeve l8.

Keyed upon the stub axles M, upon opposite sides of the crank arm, are belt pulleys 20, each formed in its periphery with a pair of grooves 21 to receive the belts 22.

Having journal support 23 in the forward ends of the side frame members is a shaft 24. The shaft 24 supports a rearwardly extending rod 25, extending slidably through the sleeve l8. Projecting forwardly from opposite ends of the shaft 24 are lever arms 26 having pivotal connection 2'! at their outer ends with the pump rods 28. As shown in Figure '1, the lever arms project downwardly in relation to the rod 25,

Having journal support in the side frame members below the shaft 24 is a shaft 29 supporting at its ends pulleys 39. The pulleys 30, as shown, are materially smaller than the pulleys 20 and are formed in their peripheries with grooves 3| corresponding to the grooves 2| of the pulleys 20, to receive the belts 22. One end of the shaft 29 projects beyond the adjacent side member of H the frame and supports a pulley 32 adapted to be connected to the source of driving power.

In order to permit relative adjustment of the pulleys 2D and 30, the journal supports for the stub axles Hi are slidable upon the frame and may be adjusted longitudinally of the frame members by means of the rods 33, said rods having threaded engagement 34 with said journal supports, the outer ends of said rods extending through the rear of the frame member and having squared outer ends 35 to permit adjustment of the rods. A cover 36 may be provided for the frame to protect the enclosed parts, said cover being secured to the frame as by fastening means 31.

Having described the several parts, operation will be readily understood. When the pulley 32 is actuated from the suitable source of power, not shown, the crank arm IE will be actuated through the medium of the pulleys 20 and 3t, and connecting belts 22. The turning of the crank arm will slide the sleeve l8 upon the rod 25, turning the axle 24 and raising and lowering the ends of the lever arms 26 to operate the pump rods 28.

There are a number of important advantages in the use of the above described construction over the constructions of jacks heretofore employed. First, the use of the ordinarily employed gears is entirely eliminated. Gears as ordinarily employed are noisy and in many other ways are objectionable and ineificient. Furthermore, a smoothness of operation and the extreme of efficiency in connection with the leverage action secured is obtained, together with the securing of a desirable relatively strong upward movement of the pump rods and a relatively rapid downward movement. The position of the sleeve I8 through the adjustment of the bearing support for the crank arms is adjustable. The slidable relationship of the rod 25 and the crank arm supported sleeve 18, in connection with the relatively short downwardly directed lever arms 26, which are connected to the pump rods, brings about a particularly efiicient and quiet lever action in the operation of the jack.

It is also possible with the construction described to efiiciently brace the mechanism by being able to position the forward supports 4 of the frame, as shown in Figure 1, directly beneath the pump rods upon the base of the pump.

A further advantage of the construction is the ease with which the device may be assembled and disassembled. In disassembling the construction it is only necessary to disconnect the cross rods '1 and 8 from the side frame members, permitting the side frame members to be separated and the intermediate pump mechanism rendered freely removable.

A particularly strong support in connection with the pump is also secured through the medium of the cross bar 8 and yoke H, and also by means of the characters of construction described a minimum of oiling is needed, and the extreme of quiet operation and long life of the operating parts is secured.

We claim:

1. A pump jack comprising a supporting framework and a pump casing, said framework comprising a pair of side members, means at both ends of said side members connecting the same together, said means at the front end of said framework having means associated therewith for detachably securing said casing to said framework, a cross shaft journalled at its ends in said side members, a working beam freely mounted on said cross shaft, a pair of lever arms formed on the forward end of said working beam, said levers extending forwardly and downwardy from said beam, a crank rotatably mounted in said side members rearwardly of said cross shaft, said crank members including a cross head having a sliding connection with the rear portion of said beam, and means for rotating said crank memher.

2. The structure of claim 1, said means connecting the forward end of said side members comprising a cross piece, said cross piece being formed to provide a pump casing seating means, and said means for securing said casing and framework together comprising a yoke-shaped member seating said casing in the bight thereof and having its free ends secured to said cross piece.

ALVIN J. DREVLOW. JOHN C. DREVLOW. RICHARD O. DREVLOW. JOHN HIRAM PETERSON. 

